The computer models still have details to resolve, but right now it appears that the only question is whether this will be a significant or a very significant snowfall.
The latest run of the U.S. model would suggest about 10 inches for Philadelphia, says Henry Margusity, a meteorologist with Accu-Weather Inc.
That's assuming the precipitation would be all snow, which is not yet a certainty. Temperatures are going to be borderline, probably quite close to freezing. In its morning discussion, the National Weather Service expressed low confidence in its snow forecast. It has not yet upgraded its winter storm "watch" to a "warning."
Regardless, Margusity believes this one will be remembered more for wind than snow amounts, in a region jaded by this season's mega-totals. The wind will the real deal, he says, with gusts up to 60 m.p.h.